Vacuum pump



FIG. 1 is a perspective view of a vacuum pump showing our new design.

FIG. 2 is another perspective view.

FIG. 3 is yet another perspective view.

FIG. 4 is a front view.

FIG. 5 is a rear view.

FIG. 6 is a side view; and,

FIG. 7 is a top view. 

The ornamental design for a vacuum pump, as shown and described. 